They are male-only, and it is the males that pass down moves. So when you breed Hitmonchan/lee/top with Ditto, the baby Tyrogue will have any egg moves that said chan/lee/top has.
This isn't as pointless as it seems - Hitmonchan/lee/top learn different moves and the Tyrogue you get can evolve into any of those three.
EXAMPLE: Hitmonchan can't learn Hi Jump Kick naturally. But if you breed a Hitmonlee that knows HJK with a Ditto, Tyrogue will have HJK. Then if it happens to evolve into Hitmonchan*, you got a kicking Hitmonchan!
- You may have to breed several eggs before you get one that evolves into ol' Jackie.